Allow pdb delta to be optionally included in a hot reload payload (#39540)

* Allow pdb delta to be optionally included in a hot reload payload

Fixes #39036

Author: pranavkm

src/Components/Web.JS/src/Boot.WebAssembly.ts

@@ -43,8 +43,8 @@ async function boot(options?: Partial<WebAssemblyStartOptions>): Promise<void> {
     }
   });
 
-  Blazor._internal.applyHotReload = (id: string, metadataDelta: string, ilDeta: string) => {
-    DotNet.invokeMethod('Microsoft.AspNetCore.Components.WebAssembly', 'ApplyHotReloadDelta', id, metadataDelta, ilDeta);
+  Blazor._internal.applyHotReload = (id: string, metadataDelta: string, ilDelta: string, pdbDelta: string | undefined) => {
+    DotNet.invokeMethod('Microsoft.AspNetCore.Components.WebAssembly', 'ApplyHotReloadDelta', id, metadataDelta, ilDelta, pdbDelta);
   };
 
   Blazor._internal.getApplyUpdateCapabilities = () => DotNet.invokeMethod('Microsoft.AspNetCore.Components.WebAssembly', 'GetApplyUpdateCapabilities');

src/Components/Web.JS/src/GlobalExports.ts

@@ -63,7 +63,7 @@ interface IBlazor {
     attachWebRendererInterop?: typeof attachWebRendererInterop,
 
     // APIs invoked by hot reload
-    applyHotReload?: (id: string, metadataDelta: string, ilDelta: string) => void,
+    applyHotReload?: (id: string, metadataDelta: string, ilDelta: string, pdbDelta: string | undefined) => void,
     getApplyUpdateCapabilities?: () => string,
   }
 }

src/Components/WebAssembly/WebAssembly/src/HotReload/HotReloadAgent.cs

@@ -185,7 +185,7 @@ public void ApplyDeltas(IReadOnlyList<UpdateDelta> deltas)
             {
                 if (TryGetModuleId(assembly) is Guid moduleId && moduleId == item.ModuleId)
                 {
-                    MetadataUpdater.ApplyUpdate(assembly, item.MetadataDelta, item.ILDelta, ReadOnlySpan<byte>.Empty);
+                    MetadataUpdater.ApplyUpdate(assembly, item.MetadataDelta, item.ILDelta, item.PdbBytes ?? ReadOnlySpan<byte>.Empty);
                 }
             }
 

src/Components/WebAssembly/WebAssembly/src/HotReload/UpdateDelta.cs

@@ -11,5 +11,7 @@ internal sealed class UpdateDelta
 
     public byte[] ILDelta { get; set; } = default!;
 
+    public byte[]? PdbBytes { get; set; }
+
     public int[]? UpdatedTypes { get; set; }
 }

src/Components/WebAssembly/WebAssembly/src/HotReload/WebAssemblyHotReload.cs

@@ -20,8 +20,8 @@ public static class WebAssemblyHotReload
     private static HotReloadAgent? _hotReloadAgent;
     private static readonly UpdateDelta[] _updateDeltas = new[]
     {
-            new UpdateDelta(),
-        };
+        new UpdateDelta(),
+    };
 
     internal static async Task InitializeAsync()
     {
@@ -42,13 +42,14 @@ internal static async Task InitializeAsync()
     /// For framework use only.
     /// </summary>
     [JSInvokable(nameof(ApplyHotReloadDelta))]
-    public static void ApplyHotReloadDelta(string moduleIdString, byte[] metadataDelta, byte[] ilDeta)
+    public static void ApplyHotReloadDelta(string moduleIdString, byte[] metadataDelta, byte[] ilDelta, byte[] pdbBytes)
     {
         var moduleId = Guid.Parse(moduleIdString);
 
         _updateDeltas[0].ModuleId = moduleId;
         _updateDeltas[0].MetadataDelta = metadataDelta;
-        _updateDeltas[0].ILDelta = ilDeta;
+        _updateDeltas[0].ILDelta = ilDelta;
+        _updateDeltas[0].PdbBytes = pdbBytes;
 
         _hotReloadAgent!.ApplyDeltas(_updateDeltas);
     }

src/Components/WebAssembly/WebAssembly/src/PublicAPI.Unshipped.txt

@@ -1 +1,3 @@
 #nullable enable
+*REMOVED*static Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.ApplyHotReloadDelta(string! moduleIdString, byte[]! metadataDelta, byte[]! ilDeta) -> void
+static Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.ApplyHotReloadDelta(string! moduleIdString, byte[]! metadataDelta, byte[]! ilDelta, byte[]! pdbBytes) -> void